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CN-121991491-A - Polyurethane material and flexible protective product prepared from same

CN121991491ACN 121991491 ACN121991491 ACN 121991491ACN-121991491-A

Abstract

The invention relates to the technical field of medical protective materials, in particular to a polyurethane material and a flexible protective product prepared from the polyurethane material. The material comprises, by mass, 60-85 parts of polyurethane dispersion, 10-40 parts of carboxyl butyronitrile latex, 0.1-0.8 part of polyether-modified polydimethylsiloxane, 0.05-0.3 part of polyether-modified siloxane, 0.2-0.8 part of reactive siloxane and 0.5-5 parts of nano silicon dioxide, wherein the reactive siloxane comprises an active functional group capable of reacting with the polyurethane dispersion and/or the carboxyl butyronitrile latex, and the nano silicon dioxide is surface-modified water-based dispersion nano particles. According to the invention, by constructing a ternary gradient dynamic leveling-reactive chemical anchoring system and a nano in-situ interface bridging structure, the cooperative improvement of surface flatness, interface bonding strength, mechanical property and chemical resistance is realized.

Inventors

  • LAN HUANGXIAN
  • LAN CHEN
  • LIU QIAN
  • LI JINGFENG

Assignees

  • 桂林恒保健康防护有限公司

Dates

Publication Date
20260508
Application Date
20260326

Claims (10)

  1. 1. The polyurethane material is characterized by comprising the following components in parts by mass: 60-85 parts of polyurethane dispersion, 10-40 parts of carboxyl butyronitrile latex, 0.1-0.8 part of polyether modified polydimethylsiloxane, 0.05-0.3 part of polyether modified siloxane, 0.2-0.8 part of reactive siloxane and 0.5-5 parts of nano silicon dioxide; Wherein the reactive siloxane comprises a reactive functional group capable of reacting with the polyurethane dispersion and/or the carboxylated nitrile latex, and the nano silicon dioxide is surface modified water-based dispersed nano particles.
  2. 2. The polyurethane material of claim 1, wherein the surface of the surface-modified nanosilica incorporates organic groups; the organic group is one or two of amino and epoxy groups which are modified and introduced by organosilane, and/or one or two of polyoxyethylene and polyoxypropylene groups which are modified and introduced by polyether chain segment.
  3. 3. The polyurethane material of claim 1, wherein the reactive siloxane comprises one or more reactive functional groups selected from the group consisting of amino groups, epoxy groups, and hydroxyl groups.
  4. 4. The polyurethane material of claim 1, wherein the nanosilica has a particle size of 5nm to 100 nm.
  5. 5. The polyurethane material of claim 1, wherein the polyurethane dispersion is an aliphatic polyester polyurethane dispersion; Optionally, the carboxyl nitrile latex is a carboxyl modified nitrile rubber aqueous dispersion, and the carboxyl grafting rate is preferably 1% -5%; Optionally, the polyether modified polydimethylsiloxane is selected from one or more of BYK-348 and TEGO glass 450; optionally, the polyether modified siloxane is selected from TEGO glass 450.
  6. 6. The polyurethane material of claim 1, further comprising one or more of a cross-linking agent, a pH adjusting agent, and an antifoaming agent; Optionally, the cross-linking agent is hydrophilic isocyanate; Optionally, the pH regulator is AMP-95 and/or ammonia; optionally, the defoamer is a silicon-free mineral oil defoamer.
  7. 7. A method for preparing the polyurethane material according to any one of claims 1 to 6, comprising the steps of: The components are stirred to form a uniform dispersion system, and then the polyurethane material is obtained through film forming treatment.
  8. 8. The method according to claim 7, wherein the film forming process includes a dipping film forming step; optionally, before the dipping film forming step, a step of dipping the substrate into a coagulant is further included; optionally, the coagulant comprises calcium nitrate, an alcoholic solvent and a pH regulator; optionally, the total solid content of the dispersion system is 30% -45%.
  9. 9. A flexible protective article, wherein the flexible protective article is made from the polyurethane material of any one of claims 1-6.
  10. 10. The flexible protective article according to claim 9 which is a film, coating or glove; Optionally, it is a surgical glove for medical use; optionally, the thickness of the flexible protection product is 0.01 mm-0.10 mm.

Description

Polyurethane material and flexible protective product prepared from same Technical Field The invention relates to the technical field of medical protective materials, in particular to a polyurethane material and a flexible protective product prepared from the polyurethane material. Background Polyurethane medical surgical gloves have been widely paid attention to the field of high-end medical protection in recent years because of their excellent softness, fit and touch, the absence of natural latex proteins, low risk of sensitization, and the like. Compared with the traditional natural latex glove or the butyronitrile glove, the polyurethane glove has obvious advantages in the aspects of comfort, air permeability and operation sensitivity, and can provide safer and more comfortable use experience for medical staff. However, the existing aqueous polyurethane system still has various technical defects in practical application. First, there is a problem that it is difficult to achieve both leveling property and adhesion property during film formation. In order to obtain a film layer with smooth surface and no pinholes, orange peel and other defects, a migration type silicone oil flatting agent is usually required to be added, but the flatting agent is easy to enrich on the surface of a material, so that the subsequent code spraying adhesive force is poor, the printing ink is easy to fall off, interlayer adhesion is possibly caused, the processing and the service performance of a product are affected, if the consumption of the flatting agent is reduced, the surface defects are easily generated, and the quality control requirement is difficult to meet. Secondly, polyurethane dispersions generally have good softness and hand, but relatively inadequate mechanical strength and solvent resistance, in terms of material properties, whereas nitrile rubber latices have higher strength and oil resistance, but a harder hand. When the two materials are simply and physically blended, phase separation is easy to occur due to poor compatibility, so that the internal structure of the materials is not uniform, and fluctuation of mechanical properties and local weak areas occur. Again, in terms of chemical resistance, the existing polyurethane gloves are susceptible to swelling, stickiness or surface whitening when contacted with common disinfectants (such as 75% alcohol or chlorine-containing disinfectant), thereby affecting their protective properties and service life. Therefore, how to improve the adhesion performance while guaranteeing the surface smoothness of the material and realize the effective synergy of the polyurethane and the nitrile rubber system, so that the material has excellent softness, mechanical property and chemical resistance, and becomes a technical problem to be solved in the field. Disclosure of Invention The invention comprises the following technical scheme: one aspect of the invention relates to a polyurethane material comprising the following components in parts by mass: 60-85 parts of polyurethane dispersion, 10-40 parts of carboxyl butyronitrile latex, 0.1-0.8 part of polyether modified polydimethylsiloxane, 0.05-0.3 part of polyether modified siloxane, 0.2-0.8 part of reactive siloxane and 0.5-5 parts of nano silicon dioxide; Wherein the reactive siloxane comprises a reactive functional group capable of reacting with the polyurethane dispersion and/or the carboxylated nitrile latex, and the nano silicon dioxide is surface modified water-based dispersed nano particles. Yet another aspect of the invention relates to a process for preparing a polyurethane material as described above, comprising the steps of: The components are stirred to form a uniform dispersion system, and then the polyurethane material is obtained through film forming treatment. Yet another aspect of the invention relates to a flexible protective article made of a polyurethane material as described above. According to the invention, the reactive siloxane and the surface modified nano silicon dioxide are introduced into a polyurethane dispersion and carboxyl butyronitrile latex composite system, so that the synergistic effect of leveling, interface anchoring and nano bridging is realized, the surface smoothness of the material is ensured, and meanwhile, the interface bonding strength is improved and phase separation is inhibited, so that the material has excellent soft hand feeling and higher mechanical property. Meanwhile, through interface structure optimization and network enhancement, the alcohol resistance and chemical resistance of the material are obviously improved, the swelling and stickiness phenomena are reduced, and the processing adaptability and the use stability are improved. Drawings In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, an